I have a suggestion for zooming in and out with the mouse wheel in the tech tree...
Basically I am a digital artist. I use many programs. Photoshop Illustrator, Corel Draw, etc...
For many years I have also used a program called Paint Shop Pro. I tend to use version 7.0 for a 'light' program that doesn't take up a lot of system resources to run. Well... (this DOES all apply to a point I am getting to)... In Paint Shop Pro version 7 (and latter versions too I believe), there is a function of the mouse wheel that is EXTREMELY organic and practical...
The mouse wheel is used by the program to zoom in and out. Scroll forward to zoom in, backwards to zoom out. Sounds simple… But what makes it phenomenal and indispensable is the specific nature of the zoom in function... Basically the program will take into account where the mouse pointer is located on the screen and use it as a center point for zooming in. So whenever you zoom in, wherever your mouse pointer is located, it will zoom into that direct area. If you zoom out, move the pointer over another area/location and zoom back in it will re-center the zoom area to where the pointer was located. The zoom always remains in the center of the cursor.
This would be EXTREMELY helpful in the GalCiv2 tech tree... You would be able to zoom in and out without needing to scroll around or drag the screen around. Just hover the mouse pointer over the spacific tech you want to see (or the branch) scroll the wheel inwards and viola! It will zoom right into what you are looking at. If anyone is not understanding what I mean get a copy of Paint Shop Pro and just open a large graphic and try zomming in and out with a mouse wheel... You will get what I mean right away. It astounds me that Adobe doesn’t implement this feature into Photoshop as it is such an absolutely natural way of moving around the screen…. In fact when I use Photoshop I want to toss my computer out the window because it does not have this feature.
If this (simple?) modification was made to the mouse wheel zoom, it would really make the tech tree an extension of the hand (even in it's split screen incarnation). Hell, it could even be applied to the general game map.
Just a thought.